package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成了登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    // 专门用来做路径比较的  路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER= new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 获取uri  判断本地请求是否需要处理  判断登陆状态  放行
        // 1.获取uri
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}",request.getRequestURI());
        String requestURI = request.getRequestURI();
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",

                "/user/sendMsg",
                "/user/login"
        };// 不需要的请求放进去

        // 2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        // 3.如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        // 4-1.需要处理  判断是否完成登录
        if(request.getSession().getAttribute("employee") != null){
            // 已经登录
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));

            // 通过线程传MyMetaObjectHandler
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        // 4-2.需要处理  判断是否完成登录
        if(request.getSession().getAttribute("user") != null){
            // 已经登录
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));

            // 通过线程传MyMetaObjectHandler
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        // 5.未登录， 通过输出流的方式 向客户端页面响应
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        //filterChain.doFilter(request,response);
        return;


    }

    /**
     * 路径匹配 检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }

}
